Chiral 3D Perovskite Single Crystals Realized by Lattice Expansion

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Chiral 3D perovskites offer unique chiroptoelectronic properties for advanced applications.
• Existing chiral 3D perovskites face synthetic challenges due to bulky chiral ligands.
• Low-dimensional chiral perovskites have limitations in carrier/exciton dynamics.

Purpose of the Study:

• To synthesize a novel chiral 3D perovskite single crystal.
• To develop a device for detecting circularly polarized light (CPL) using this material.
• To investigate its second harmonic generation (SHG) properties.

Main Methods:

• Synthesis of a novel chiral 3D perovskite single crystal: [(R/S)-3APr]2Pb4I12·2H2O.
• Incorporation of chiral ligands and water molecules into 3D inorganic frameworks.
• Fabrication of a chiral 3D perovskite-based CPL photodetector using an electrode-transfer strategy.

Main Results:

• The fabricated photodetector demonstrated excellent performance with a high photocurrent anisotropy factor (gIph) of 0.4.
• The non-centrosymmetric chiral 3D perovskite exhibited efficient second harmonic generation (SHG).
• A large circular polarization sensitivity of SHG (optical anisotropy factor of 0.83) was achieved, extending CPL detection to the near-infrared region.

Conclusions:

• A novel chiral 3D perovskite, [(R/S)-3APr]2Pb4I12·2H2O, was successfully synthesized and characterized.
• The developed CPL photodetector shows high performance, indicating potential for advanced optical sensing.
• The material's SHG properties and extended CPL detection range highlight its versatility in chiroptical applications.